动态更改UINavigationController样式 - objective-c

// 导入头文件
#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 创建一个导航栏
    UINavigationBar *navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 64)];
    navigationBar.barTintColor = [UIColor blueColor]; // 设置导航栏背景颜色
    navigationBar.tintColor = [UIColor whiteColor]; // 设置导航栏按钮颜色
    [self.view addSubview:navigationBar];
    
    // 创建一个导航栏项
    UINavigationItem *navigationItem = [[UINavigationItem alloc] initWithTitle:@"首页"];
    UIBarButtonItem *rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"更换样式" style:UIBarButtonItemStylePlain target:self action:@selector(changeNavigationBarStyle)];
    navigationItem.rightBarButtonItem = rightBarButtonItem; // 添加右侧按钮
    navigationBar.items = @[navigationItem]; // 设置导航栏项
}

- (void)changeNavigationBarStyle {
    // 更改导航栏样式
    UINavigationBar *navigationBar = self.navigationController.navigationBar;
    navigationBar.barTintColor = [UIColor redColor]; // 设置导航栏背景颜色
    navigationBar.tintColor = [UIColor yellowColor]; // 设置导航栏按钮颜色
}

@end